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Make "Stateless" mode sessionless (#760)

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- This removes the requirement to configure data protection which is the motivating reason for this change
- This means that McpServer.ClientInfo will always be null in stateless mode
This commit is contained in:
Stephen Halter 2025-10-02 15:57:01 -07:00 • committed by GitHub
commit 47b9582fd7
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2 changed files with 28 additions and 72 deletions
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6
src/ModelContextProtocol.Core/Server/McpServer.Methods.cs
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@ -416,7 +416,7 @@ public abstract partial class McpServer : McpSession, IMcpServer
{
if (ClientCapabilities?.Sampling is null)
{
if (ServerOptions.KnownClientInfo is not null)
if (ClientCapabilities is null)
{
throw new InvalidOperationException("Sampling is not supported in stateless mode.");
}
@ -429,7 +429,7 @@ public abstract partial class McpServer : McpSession, IMcpServer
{
if (ClientCapabilities?.Roots is null)
{
if (ServerOptions.KnownClientInfo is not null)
if (ClientCapabilities is null)
{
throw new InvalidOperationException("Roots are not supported in stateless mode.");
}
@ -442,7 +442,7 @@ public abstract partial class McpServer : McpSession, IMcpServer
{
if (ClientCapabilities?.Elicitation is null)
{
if (ServerOptions.KnownClientInfo is not null)
if (ClientCapabilities is null)
{
throw new InvalidOperationException("Elicitation is not supported in stateless mode.");
}

2
src/ModelContextProtocol.Core/Server/McpServerExtensions.cs
View file

@ -24,7 +24,7 @@ public static class McpServerExtensions
/// <exception cref="InvalidOperationException">The client does not support sampling.</exception>
/// <remarks>
/// This method requires the client to support sampling capabilities.
/// It allows detailed control over sampling parameters including messages, system prompt, temperature,
/// It allows detailed control over sampling parameters including messages, system prompt, temperature,
/// and token limits.
/// </remarks>
[Obsolete($"Use {nameof(McpServer)}.{nameof(McpServer.SampleAsync)} instead. This member will be removed in a subsequent release.")] // See: https://github.com/modelcontextprotocol/csharp-sdk/issues/774